/**app.wxss**/
.container {
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 200rpx 0;
  box-sizing: border-box;
} 

.backTop {
  position: fixed;
  right: 50rpx;
  bottom: 50rpx;
  width: 100rpx;
  height: 100rpx;
  border-radius: 50%;
  color: #fff;
  text-align: center;
  background-color: rgba(0, 0, 0, 0.5);
  font-size: 28rpx;
  padding-top: 13rpx;
  box-sizing: border-box;
}
